Teletypewriter or printing-telegraph



E. GI C. LUFGHEN.'

TELE'YPEWRITER 0R PRINTING TELEGRAPH.

APPLICATION FILED APH. 21, IoIIs.

"WPP/5 j fd /Qg 7/ E. G. C. LOFGHEN.

TELETYPEWRITEH 0R mmm@ TELEGRAPH.

n APPLICATION FILED APR. 21| 1916. h A n n s @LSSQ jaemzec Aug 9 ZQ airs rares EINAR G. C. LOFGREN, OF MINNEAPOLIS, MINNESOTA.

TELETYPEWRITER OB, PRINTING-TELEGRAPI'I.

indienen,

Specification of Letters Patent.

Patented Aug, 3, 19205.

Application filed April 21, 1916. Serial No. 92,646.

To all whom t may concern:

.a subject ot the ling'ot Great Britain, re-

siding at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and usei'ul improvements in Teletypewriters or Printing-Telegraphs; and l do hereby declare the following to be a full, clear, and exact description oi' the invention, such as will enable others skilled in the art towhich it appertains to make and use the same. y

rlhis invention relates to improvements in telegiinah typewriters.

The object of the present invention is to improve the constructionL of telegraph typevriters and to provide simple, practical and highly eliicient mechanism adapted to be readily applied to various styles of typewriting machines oj standard make and adapted to be operated by a typewriting machine at the transmitting end of the line and ci simultaneously actuating electrically a typewriter at the receiving end of the line so that a permanent record may be made in typewriting on each machine.

A further object ot' the invention is to provide telegraph typewriter .ieehanism adapted to be operated over a singlemain line or circuit and capable ofenabling the typewriting machine "to be operated independentlyof the electrical actuating means andwithout injury to the latter.

lilith these and other objects in view, the invention consists in the construction and novel combination of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended' it being i-.nderstoodr that various changes in the form, proportion, size and minor details otconstruction, within the scope ci the claims, may be resorted to without de" artino' from the soirit or sacrificing any of the advantages of the invention. Y

ln the drawings Figure 1 is diagrammatic view ot the circuits of the transmitting typewriter,

n ig. 2 is a transverse sectional view, illustiating the arrangement of the keys ,or key levers, of the transmitting typewriter and the contacts operated by the said keys or `key levers,

Fig.y e is a planview of the electrical mechanismV for actuating the keys or key levers of the receiving typewriter,

Fig. 5 is an elevation of the arcuate switch and the oscillatory contact arm or member, `Fig. 6 is a detail view of the mechanism for operating the switch for controlling the magnets or solenoids-of the two sets of keys or key levers,

Fig. 7 is a vertical sectional view taken longitudinally of the mechanism of the receiving typewriter, n y n c Fig. 8 yis a diagrammatic view partly in perspective illustrating the instrumentalities and the wiring oit the same oi both the sending and receiving typewriters.

`Fig. 9 is a detail sectional view of the spring actuated locking lever,

. Fig. 10 is a detail view of one of the keys.

Like numerals ot' reference designate corresponding parts inthe several figures ot the drawings.

ln, the accompanying drawings in which isfillustrated the preferred embodiment of the invention, the transmitting typewriter is equipped with an interrupted local circuit, and induction coils in the transmitting and receiving typewriter which enable a switch of one-half the size and number of contacts to be employed for controlling the key actuating magnet ot the receiving typewriter. rlhe key board oi the transmitting typewriter has its keys arranged in two sets,

the sets being ratei-red to as upper and lower sets and designated respectively by the numerals 1 and 2 and provided with depending contact arms or portions 3 having roller contacts l adapted to reduce friction to a minimum but any other suitable torni oi contact may be employed as will be readily understood. rlhe transmitting typewriter is equipped with a resistance 5 preferably in the form `et a coil from which extend conducting wires 6 having branches 7. and 8 connected with contacts 9 and 1() consisting of( approximately l shaped spring plates and located beneath and in the path of the contacts of the keys or key levers whereby when `a key is depressed a connection will be Vmade between the key and one of the branches of the conducting wires 6 of the resistance. The resistancev coil 5 is connected with the secondary winding 11 of an induction coil 12 by a wire 5a and the said secondary winding is connected with the wire 13 of the main line'circuit by a wire 5b through the resistance coil and by means of the mechanism hereinafter described each of the conducting wires 6 of the resistance coil is connected with twov keys, one in each set thereby reducing the number of contacts and the size of a key selecting switch, onehalf.

The keys of the upper set comprising the two upper rows oil keys or key levers simply close the main line circuit through the re` sistance coil but the keys of the lower two rows or sets also close in addition thereto contacts 14 and 15 consisting of spring plates having contiguous substantially parallel upper portions located in the path of the contacts carried by the keys of the lower set and adapted tc be closed by the depression of the said key of the lower set. The contacts 14 and 15 are connected by wires 16 and 17 with the primary winding 18 of the induction coil 12 to form a local circuit which is closed simultaneously with lthe main line circuit when a key in the lower set is depressed and which includes a battery 18a. An interrupter 19 is placed in CircuitV with the primary winding of the induction coil in the local circuit for causing ripples or impulses in the primary winding for inducing a current in the secondary winding for operating a switch in the mechanism oit the receiving typewriter as hereinafter fully explained. f

The main line or circuit may consist of a single wire grounded or a return wire may b e employed as will be readily understood and the contact roller 4 is connected with the wire 13ZL of the main line which may be eiiected by an insulated wire 4a extending from the contact roller or wheel 4 to the wire 4l which is connected to the wire 13a or the body of the key may be'used as a conductor and the wire 4b ol the main lineV may then be connected to the key. `Binding posts 21 are provided for the wires of the main line or circuit and other binding posts 22 are provided for the local circuit and a battery 13b is includedV in the main line circuit. WV hen the keys are employedas conductors suitable insulatingcaps (not below a single set of contacts 35 which is adapted to engage with either of the sets of contacts 33 and 34 for connecting the separate sets of key actuated magnets with means for energizing'the magnets, one set or the other of the separate sets of magnets being connected vwith the said means. By means of wires 31n and 32a, the solenoids 28 is actuated by a core 37 of a solenoid 38 for" partially rotating the said member 35ZL to carry either set of contacts 33 and 34 into engagement with the single set'of contacts 35. ranged in circuit with the secondary winding 39 of an induction coil 40 is connected with the said secondary winding by wires which constitute a local circuit 41 for the receiving typewriter. The primary winding 42 of the induction coil 40 is arranged in circuit with the main line or circuit by wires 13c and 13d so that when ripples or oscillations are caused by the closing of the local circuit oi the transmitting typewriter the induced current will cause correspond ing oscillations or electrical impulses in the secondary winding of the induction coil 4() for operating the solenoid 38 and moving the switch member 35a so that the lower contacts 34 will be `moved out of engagement with the contacts and the upper contacts 33 will be moved into engagementV with the contacts A spring 35b is connected to the lever 36, and is adapted to normally hold the lower contacts 34 in engagement with the contacts 35. The magnet controlling switch is .locked in its depressed position by means of a catch 43 consisting of a lever fulcrumed at 44 and provided with an engaging portion 45 adapted to be car ried into the path of the lever 36 by a spring 46. The engaging portion 45 is preferably in the form of a tooth beveled at the upper portion or edge and having a` lower shoulder. v This will ena-ble the lever to pass the tooth on the downward movement and to be locked against upward movement. rlhe catch or lever 43 is provided with a curved arm 47. which is arranged in the path of a pivoted oscillatory contact arm or member 49 of a key selecting switch 50. The key. selecting switch 50 comprises an arcuate guiding frame or partial casing 5l having upper and lower guide plates or flanges 52 and 53 and provided atintervals with contact plates 54 which are connected by wires with the fixed contacts 35 of the single set of the magnet controlling switch. he guide frame or casing 51 may be constructed of insulating material or the contact plates may be mounted in suitable insulation and their lower edges 56 (see Fig. 5) are bevand `29 are connected to a wire 32b leading The verticalsolenoid 38 which is areled as shown to assist in guiding a roller 57 of the contact arm or member 49 into engagement with the contact plates and the said roller is adapted to move upwardly on the contact -plates 54 when the depressed key is released as hereinafter fully explained to close the local key magnet circuits for actuating the key or key lever of the receiving typewriter to print the required chari acter.

lThe pivoted contact arm or member 49 is mounted at its inner or pivoted end on the upper end of a hollow core 58 ot a solenoid 59 arranged vertically and in circuit with the main line. rlhe wires 13C and 13d connect the solenoid 59 with the main line wires 13 and 13a. rTheA arm or member`49 is suitably secured to the hollow core which is slidably mounted on a vertical guide rod 60 and which alsoicontains a coiled spring 61 adapted to move the core 58 upwardly and outwardly when the solenoid 59 is denergized by the opening ot' the main line circuit through the releasing of the key of the transmitting typewriter. rllhe coiled spring is compressed when the core 58 is moved downwardly and inwardly through the closing oi' the main line circuit and the pivoted contact arm or member 49 is drawn downwardly 'from the upper portion of the guide frame 51 to the bottom guide plate 53 when the said solenoid 59 is'energized, The particular mounting of the arm 49 permits the latter to oscillate and also to move upwardly and downwardly.

rlhe pivoted arm normally occupiesl the position shown in Fig. 4 of the drawings at the lei't hand end of the arcuate guiding frame or casing and it is swung to the right from such position by a horizontally disposed solenoid 62 arranged in the main line or circuit and having a core 63 pivotally connected at 64 to the contact arm or member 49. The solenoid 62 is connected by the wires 13c and 13Y with the rmain line wires 13 and 13a. When the main line or circuit is closed by depressing a key the vertically and horizontally disposed solenoids are energized and the arm or member 49 is iii-st depressed by passing the current through the vertically disposed solenoid and'is then swung to the rightk by the currentpassing through the horizontally disposed4 solenoid 62. llVhen the key is released opening the` main line circuit, the Yspring 61 operates to move the contact roller upwardly over one of the contact plates 54 ot the key selectingY switch 50 thereby energizing the key magnet circuit and operating the key ot the receiving typewriter. The pivoted arm or member is returned to its initial position by a spring 65 which is of less strength than the spring 61 so that the latter will respond and move the pivoted arm upwardly before the spring 65 swings the pivoted arm back 'to its initial position. The magnets or solenoids'ot the receiving typewriter are preferably arranged at diii'erent elevations to enable them to be closly assembled as clearly illustrated in Fig. 7 of the drawings. Vhen one of the keys of the upper set or series of the transmitting typewriter is depressed the main line circuit is closed and the current passes through the resistance coil and through the secondary of the induction coil 12 along the main line to the receiving typewriter passing through the solenoid 59 drawing the pivoted arm and the core 5S of the vertical solenoid 59 downward and passing through they horizontal solenoid 62 to swing the pivoted arm along thek arcuate key selecting switch to the proper contact. lllhen the key is released and the main line circuit is open the'solenoid 59 is deinergized permitting the coiled spring 61 to move the core 5S upwardly and carry the roller 57 over the contact 54A to close vthe solenoid or magnet circuit ot' the keys for actuating the particular corresponding key of the' receiving typewriter. rlhe pivoted arm 49 may be used as conductor and the' current from the local battery 49El passed through 'the same. The arm 49 is connected tothe battery 49 by a wire 49b and a wire 49. rrlhe wire 49.c is connected to a suitable binding screw or postv 66 at the inner pivoted end of the arm 49. rlhe other connections with the pivoted arm at the Y* spring and the solenoid are ot course in sulated. As soon as the Contact roller of the arm 49 leaves the coacting contact plate 56 the solenoid or magnet circuit will be opened and the depressed key oi the receiving typewriter released. iter establishing thekey operating circuit and depressing the receiv-v ingkey thefarm49 is swung back by the light spring 65. y

Each of the wires 6 as previously pointed out is'provided with two branches Aand when a key of the lower branch 8 is depressed, the currentpasses through the same portion of the resistance coil 5 as when the lkey ot the upper branch 'l' is depressed but the contacts 14 and 15 are also closed closing the local or vmagnet 38 willA energize operate the magnet: or solenoid controlling switch'and carry theV movable switch member 'from the lower contact 53 to the upper contact 52 to ,cause a current to be sent through a magnet or solenoid of the lower set. rlhe closing of the line circuit when 4one of the upper keys is depressed naturally causes a current in the secondary of the induction coil of the receiving typewriter but it is of too short a duration to act upon the solenoid and operate the core or'plunger thereof.

At the end of each line a keyv 67 is de pressed for sending a current over the main line or circuit around the resistance coil 5. T he contact 6a of the key 67 (see Figs. 1 and 8) is connected by a wire 68 with a horizontally disposed solenoid 69 that is also connected by a wire 70 withthe wire 5LL (see Fig. 1) that connects the resistance coil 5 with the secondary coil or winding 11 of the induction coil 12. The key 67 is connected to the wire 4b by a wire 71. The solenoid 69 is adapted to actuate the carriage and move the same from one side of the machine to the other. The solenoid 69 is provided with a core 71a which is connected by a rod 72 with a pinion 73 mounted upon a fixed rack bar 74 andmeshing with a movable rack bar 75 having an arm 76 that is connected with a pinion 77. The arm 76 is approximately E shaped to arrange'the pinion 77 in position to roll upon a fixed rack bar 78 that is located above and eX- tends over the solenoid 69. The pinion 77 also meshes with a movable rack bar 79 that constitutes a portion of the carriage, not shown, and when the solenoid 69 is energized the pinions are caused to move along the fixed rack bars and actuate the movable rack bars and increase the movement of the core 71n sutiiciently to carry the carriage of a typewriter from one side of the 4machine to the other. The receiving typewriter is also equipped with the solenoid 69a f and the mechanism actuated by the same for returning the carriage of the receiving typewriter to the starting point and the solenoid of the carriage actuating mechanism is connected by a wire 8O with a contact 81 located at the extreme right hand end of the key selecting switch in Fig. 4 and with the wire 32b by a wire 70a. )When a currentfis sent over the line wire by means of the key 67 past the resistance without goingl through the same, the pivoted arm or contact member 49 is swung from one end of the guide frame or casing 51 to the other and carried into contact with the contact member 81 thereby closing the circuit of the carriage actuating mechanism. The wires 6, which arev connected wiith keys of'theisending typewriter, are connected with the resistance coil 5 at different points along the same so that currents of diiferent strength will be sent over the main line to the receiving typewriter by reason of the current passing through portions of the resistance of diierent lengths. This will enable the current to operate the horizontally disposed solenoid 62 and move the core 63 dilerent distances so that the pivoted arm 49 of the switch 50 will select the proper contact 54 of the guide frame `or casing `for operating the proper key of the receiving typewriter.

' The circuits through the keys are as follows: When one of the upper set of keys 1 is depressed, the key is carried .into contact with the contact 9 (see Fig.` 8) and the circuit Yis closed, the current passing along the wire 6 by way of the branch 7 (see Fig. 1) to the resistance 5, passing through a portion of the same along the wire 5a to the induction coil 12 through the secondary windingll thereof, through the wire 5b to the main line wire 13 through the wire 13, to the primary winding 42 of the induction coil 4 0 (see Fig. 4), thence .to the vertical solenoid 59 through the wire 13d, thence to the horizontal solenoid 62, thence to the main line 13EL and battery 13", and thence through the wires 4b and 4". back to the roller contact of the key 1.

Should one of the lower keys be depressed, the contacts 14 and 15 will be closed and a current will be established through the local circuit including the primary winding 18 of the induction coil 12 and the interrupter 19 producing impulses through the main line circuit by reason of the currents induced in the secondary winding 11. This will causethe Vimpulses to be produced in the primary winding 42 of the receiving typewriter and currents or impulses will be induced in the secondary winding 39 (see Fig. 4) and the current will pass through the vertical solenoid 38 which is in circuit with the secondary winding of the induction coil 40 by means of the wires 41. The solenoid 38 will operate the pivoted member 35awhich carries the contacts 33 and 34 and will move the upper contact 33 into engagement with the Contact 35 and carry the lower contact away from the contact 35. )When the upper contact 33 is. in engagement with the relatively iiXed Contact 35, the current through the solenoid circuit will be through one of the lower set of solenoids and will operate one of the lower keys, and when the lower' contact 34 is in engagement with, the relatively fixed contact 35, the circuit of the solenoids will include one of the upper set of solenoids and one of the upper keys will be operated.

rlhe currentpasses from the upper set of keys 1 to the resistance coil 5 thence to the upright solenoid 59 and depresses the switch arm 49 (Fig. By the action of the horizontal solenoid 62 this arm is moved along the insulating path 53 of the switch casing 51 for va distance corresponding to the amount of resistance employed at the transmitting end of the switch. As soon as the transmission key is released, the strong spring 61 causes thel switch arm 49 to ascend and, establishes electric vcontact by means of the roller 57 with the respective contact 54 of the switch and which by means of wires 55 is connected to the corresponding stationary contact 35. In operating one of the two sets oi keys, the upper set 1 in particular, the current will now pass through 35 to one oit the sets of connecting contacts 34 by means of one ot the wires 55 and thence by means of one et the wires 31 to one of the solenoids 28 of the receiving keys. H on the other hand the other set of transmission keys 2 is operated a branch circuit is established through contacts 10, 14, 15 in addition to the circuit established by the amount of current which passes directly into the switch arm `49 as above pointed out. By the action of the interrupter 19 a pulsatingr current is generated in the secondary coil 11 which passes through the primary coil 42 of the induction coil 40 and which by means of the secondary coil 39 of this coil 40 causes the solenoid 38 to be energized. rlhis solenoid 38 attracts its core 37 with the armature lever 36 and thereby rotates the rod 35LL which is secured to one end of the armature 36. By the rotation of the rod 35, the movable contacts 33 or 34 which are mounted at the outer end of this rod are turned around and changed so as to bring, for instance, the upper set 33 of the movable contacts into direct connection with the stationary contacts 35 and by means of the wire 55 with the switch arm 49. When depression of the transmission key has ceased, the armature lever 36 is retained in its depressed position in which it determines the position of one set of movable contacts 33 and 34 respectively, and by means of engagement with the pivoted curved arm 47 it will be retained in this operating position as long as the switch arm 49 is in contact with the corresponding contact 54, but as soon as the switch arm 49 has been withdrawn by the light spring the pawl or locking means 47 is released. By means of the spring 46 the pawl 40 is kept in engagement with the armature lever 36. When the switch arm 49 has been moved to the end of its path, it will strike against the Vfree end 4? of the lever 43 thereby swinging said lever or pawl and releasing the armature 36 and thereby also rotating the rod 35a and restoring theoriginal position of the sets of contacts 33 and 34. When the lower contact is inengagement with the fixed contact 35 the current passes through thev arm 49, contact 54, the movable lower contact 34, and to the upper set of solenoids 23 and the battery 49a. Vhen the rod 35 has been rotated, as vabove explained, the other set of movable contacts 33 is turned into operating position, the operation remaining .i the same with the exception that the current now passes from the contact 35 to the Ynected with Contact 33 Yand thence to the wire 32 energizing the solenoids 29 of the other set of receiving' solenoids. In practice the typewriters will be equipped with the usual mechanism for automatically rotating the platen when the carriage is oarried from one side the machine tothe other. A signal bell 34 at the receiving type-v writer may be operated by a'key 85 at the sending typewriter. The circuit under the control of this key includes a contact 85a, wire-35l, resistance 5, wire 5a, secondary coil 11, wires 5b, 13 and 13, primary coil 42, wires 13d, 13a, 4" and 85 and Contact wheel 35d. The battery 13b and the solenoids 59 and 62 are included in this circuit. rlhe bell circuit includes the battery 49, wires 32b and 84a, wire 34h, one of the contacts 34, one of the wires 55, one of the contacts 54, arm 49, and wires 49C. and 49h. l/Vhen the key 35 isl depressed and released the solenoids 59 and 62 are energized, resulting in the arm 49 moving over that contact 54 which is in the bell circuit and closing such circuit. rl`he bell 34 may be ope erated in code to indicate the character of paper to be employed or to convey any other desired information relative to preparing the receiving typewriteror thereception of a message. ln practice the supports or bars 32 upon which the contacts 9, 10, 14 and 15 are mounted (Fig. 2) will be pivoted as shown vat 33 to permit the contacts to be swung downwardly out of theA path of the depending contacts ot the keys so that the transmitting typewriter may be operated without wearing the contacts when the machine is used for ordinary typewriting and not for sending messages.

What is claimed is 1. Printing telegraph including a key sel member arranged to swing longitudinallyy ot the switch and movable between the guides over the contacts, a solenoid having a-core constituting a pivot for the movable arm or member, key actuating magnetic means-conthe said rcontacts,ra'n electromagnet connected with the arm for swinging the same in one direction, a spring for moving the arm in the opposite direction and a spring for moving the core oi the said solenoid to an extended position when the said solenoid is denergized.

2. l?rinting telegraph includng a key selecting switch comprising arcuate upper and lower guides, spaced contacts located between the guides, key actuating magnetic means connected with the contacts, a pvoted contact arm arranged to swing between the guides andl movable upwardly and down-` wardly, a solenoid having a core forming a when the solenoid is energized to move the arm or member downward, a spring for automatically moving the arm or member upwardly when the solenoid is de'energized, a solenoid having a core connected with the arm or member for swinging the saine and springs connected with the said cores for moving the same to their extended positions, the spring of the core which constitutes the pivot of the arm being of greater strength than the other spring.

3. Printing telegraph including. separate sets oi. key actuating magnetic means, a magnet controlling switch comprising fixed and relatively movable members, one of the members having spaced sets of contacts electrically connected with the separate sets of magnetic means and the other member having contacts arranged to contact with either of the said sets ot contacts, a key selecting switch having spaced contacts connected with the magnet controlling switch, a movable contact member cooperating with the contacts of the key selecting switch and electrically operated means for actuating thev said movable contact member and for operating the magnet controlling switch.

4l. Printing telegraph including a magnet controlling switch comprising fixed and 'relatively movable members, spaced sets of contacts carried by one ofthe members, a single set of contacts located between the spaced sets of contacts, key actuating magnetic means arranged in separate sets and electrically connected with the separate sets of? contacts carried by one of the members et' the said switch, a key selecting switch having spaced contacts connected with the single set of contacts ot' the magnet controlling switch, a movable arm or contact coacting with the contacts of the key selecting switch. magnetic means for actuating the movable member of the magnet lcontrolling switch, ra

main line circuit, an induction coil having its'primary winding in circuit with the mainV line circuit and its secondary winding 4operatively connected with the said magnetic means, a local interrupted circuit and asending induction coil having its primary winding in the local circuit and a secondary winding in the nain line circuit and separate sets of operating devices having means tor closing the main line circuit, oneof the said sets being also provided. with means tor closing the local circuit. i

5. Printing telegraph including separate sets ot' key actuating magnetic means, a key selecting switch having contacts, av magnet controlling switch having separate sets of contacts connected with the magnetic means and operable to connect either set of magnetic means with the key selecting switch contact, a movable contact member coacting with the contacts of the key selecting switch, a main Aline circuit connected with the key selectingswitch, a receiving induc-` tion coil having its primary in the main line circuit and its secondary connected with the operating means of the magnet controlling switch, a local sending circuit, a sending induction coil having its primary in the local sending circuit 4and its secondary in the main line circuit and separate sets of operating means for closing the main line circuit and the local circuit.

6. Printing telegraph including separate sets of key actuating magnetic means, av magnet controlling switch comprising xed and relatively movable members, one ot the members being provided with spaced sets oit contacts connected with the said magnets and the other member being provided with a single set of contacts located between the spaced sets of contacts and arranged to engage either set, a lever connected with the movable member of the said switch, means for automatically moving the lever in one directionand magnetic means for actuating the lever in the opposite direction.

7. Printing telegraph including separate sets of key actuating magnetic means, a magnet controlling switch comprising fixed and relatively movable members,` one of themembersbeing provided with spacedA sets of contacts connected with the said magnetic means and the other member being provided with a single set of contacts located between the spaced sets of contacts and arranged to engage either set, a leverV connected with the movable member of the said switch, mechanicalV means for automatically moving the lever in one direction and magneticmeans for actuating the lever in the opposite direction, means for locking the lever lagainst movement after it has been actuated by the magnetic means, a key selecting switch havingicontacts connected with the single set of contacts of the magnet controlling" switch, a movable member coacting with the contents of the key selectying switch, and means for operating said movable member, said movable member being adapted to release the said lever of the magnet controlling switch when moved to its initial position.

8. Printing telegraph including separate sets of key actuating magnetic means, a magnet controlling switch comprising iiXed and relatively movable members, one of the members being providedrwith spaced sets of contacts connected with the said magnetic means and the other member being pro` vided with a single Vset'ot contacts located between thewspaced` sets of contacts and arranged to engage either set, a lever connected with the movable member of the said switch, means for automatically moving the lever 'in one direction and magnetic meansV for actuating the lever-in the oppositeV direction, a spring actuated lever arranged to automatically engage the said lever for locking the latter against movement after the same has been actuated by the magnetic means, a key selecting switch including contacts connected with the single set of contacts of the magnet controlling switch and a movable member coacting with the contacts of the key selecting switch, and arranged to engage-the spring actuated lever for moving the same out of engagement with the other lever. Y

9. A printing telegraph system including a key selecting switch havingfcontacts, an oscillating arm coacting with said contacts, magnetic means operably connected to said arm, a line circuit on which the said magnetic means are arranged, a single common resistance on said circuit and operating devices connected with varying amounts of said common resistance for closing a local. circuit, a sending induction coil having its primary in the local circuit and its secondary in the main line circuit, a receiving induction coil having its primary in the main f line circuit and electrically operated means connected with the secondary of the receiving induction coil for operating the key selecting switch. I

l0. Printing telegraphincluding separate sets of key actuating magnetic means, a a key selecting magnet provided with contacts, a movable contact member coacting with the contacts of the said switch, a magnet controlling switch for connecting either set of the magnetic means with the contacts of the key selecting switch, a main line circuit, magnetic means in the main line circuit for actuating the said movable member, a resistance in the main line circuit, conducting wires extending from the resistance andyhaving pairs of branches provided with contacts, separate sets of operating devices having contacts coacting with the contacts of the said branches for closing the main line circuit through the resistance,

a local circuit having lcontacts arranged to be closed by one set of the operating de vices, a sending induction coil having its secondary in the main line circuit and its primary in the local circuit, a receiving induction coil having its primary in the main line circuit, and electrically operated means connected with the secondary of the receiving induction coil for operating the magnet controlling switch.

l1. Printing telegraph including separate sets of key actuating magnetic means, a key Iselecting magnet provided with contacts, a movable contact member coacting with the contacts of the said switch, a magnet con trolling switch for connecting either set of the magnetic means with the contacts of the key selecting switch, a main line circuit, magnetic means in the main line circuit for actuating the said movable member, a reing its primary in the local circuit and its secondary in the main line circuit, a receiv-f ing induction coil having its primary in the main line circuit and electrically operated means connected with thesecondary of the receiving induction coil for operating the magnet. controlling switch.

l2. Printing telegraph including carriage actuatingy means comprising a magnetic means having a horizontally movable core, upper and lower iiXed rack bars, upper and lower movable rack bars arranged in spaced relation with the fixed rack bar and pinions meshing with the said rack bars, the lower pinion being connectedfwith the core of the magnetic means and the upper pinion being connected with the lower movable rack bar. i c

13. Printing telegraph including a key selecting switch having spaced contacts, a movable member coacting with the said contacts, a resistance, a main line circuit in which the resistance is arranged, a magnet arranged in the main line circuit for actuating the said member, operating devices Jfor closing the main line circuit through the resistance, a separate operating device for closing the main line circuit past the resistance for moving the said member beyond the contacts of the key selecting switch, a terminal contact arranged within the path of the said member, a carriage actuating circuit in which the terminal contact is arranged and means in the last named circuit for operating the carriage.

14e. A printing telegraph system including a main line circuit, transmitting means and recording means arranged on said circuit, a movableJ record receiving member, an

electrically operated movable contact closing member on said circuit adapted to be operably connected with said record receiving member, a movable power transmitting member operated by said circuit, substantially parallel with said record receiving member and movable power multiplying means between said transmitting member and said record receiving Vmember.

15. A printing telegraph system including a main line circuit, transmitting means arranged on said circuit, recording means on said circuit, a movable record receiving member, an electrically operated movable contact closing member on said circuit adapted to be operably connected with said receiving member, movable power transmitting means operated by said circuit, and parallel with said record receiving member and separate therefrom, a JtiXed rack bar parallel thereto and in spaced relation with said means, another fixed parallel rack bar at a still greater distance from said record receiving member and beyond the iirst mentioned rack bar and in engagement with said power transmitting means, a movable rack bar carrying means at one side lto engage with said power transmitting means and having means at the other side to engage with the irst mentioned rack bar and with the record receiving member.

16. A printing telegraph mechanism including upper and lower sets of recording keys, la local battery, a plurality of contacts, upper and lower sets of key actuating magnets connected to one side of said battery, means for connecting either the upper` or lower set of magnetsto said contacts, an arm connected to the other side oit said battery and adapted when actuated to engage one of said contacts, transmitting keys, and means under the control of said transmitting keys for actuating said first named means and said arm.

17. A printing telegraph mechanism -including upper and lower sets of recording keys, a local battery, a plurality of contacts, upper and lower sets of key actuating magnets connected to one side of said battery, means for connecting either the upper or lower set of magnets to said contacts, an arm connectedwith the other side of said battery and adapted when actuated to engage one of said contacts, an upper set of transmitting keys, means Linder the control of said keys for actuating said arm, a lower set oi' transmitting keys controlling said arm actuating means, and means under the control of said lower set of keys for actuating the means for connecting either the'upper orlowerset of magnets to said contacts.

18. A printing telegraph mechanism including upper and lower sets of transmitting keys, upper and lower sets of recording keys, a recording key selecting switch under the control of both vSets of transmit 

